This is a new GREENLEE REAR SHOE HITCH PIN #54545 for holding a rear shoe being stored on a GREENLEE 555!  These can easily fall off your Greenlee 555 and get lost.  This can cause your expensive shoe to fall off, or make it a quick easy steal by some idiot on a jobsite, while your guys are on break!  If you don't need it now, it's good to have one for a back up.  They are not usually in stock at your local Greenlee Dealer. This is made for Greenlee Benders, but it will also fit your Current or Ensley brand conduit bender.